The Solid State

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Solids are classified as crystalline and amorphous on the basis of the order of arrangement of constituent particles.

Crystalline solid	Amorphous solid
Solids which have regular orderly arrangements of constituent particles (Long range order)	Solids which have an irregular arrangement of constituent particles Short range order.
They have a sharp melting point.	They melt over a range of temperature.
They give regular structure on cleavage.	They give irregular structure cleavage.
They are anisotropic, i.e.; they have different optical and electrical properties in different directions due to different arrangements of particles in different directions.	They are isotropic, i.e.; the value of physical properties is same in all directions due to the irregular arrangement in all directions.
They have high and fixed heat of fusion.	They do not have fixed heat of fusion.
For example, Diamond, Graphite, NaCl, Metal (Fe, Cu, Ag etc) ice.	For example, Glass, rubber, plastics, Quartz glass.